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. 9 7 R. L. sHRocK FIRE BOX FOR OIL BURNERS AND THE LIKE Filed Jan.20. 1926 2 Sheets-$heet l auvewioa attain m r v 1,647,318 NOV. I, R. L.

FIRE BOX FOR 01L BURNERS. AND THE LIKE Filed Jan. 20. 1926 .2 sheets-sheet 2 [70L L 0 L "Sf/ROCK Patented Nov. 1, 1927.

UNITED STATES PATENT OFFICE.

ROLLO L. SHROGK, 0F MARION, OHIO, ASSIGNOR TO THE MARION STEAM SHOVEL COMPANY, OF MARION, OHIO, A CORPORATION OF OHIO.

FIRE BOX FOR OIL BURNERE AND THE LIKE.

Application filed January 20, 1926. Serial No. 82,432.

This invention relates to fire boxes for oil burners and the like and is designed more particularly for use in connection with the boiler of a steam shovel.

Oil burners as heretofore used in connection with steam shovels have been ineflicient and unsatisfactory, due largely to the fact that the fire boxes were of such a construction that the flame and products of combustion from the burner were delivered to the fines at one side of the boiler, practically to the exclusion of the fines at the other side thereof, thus providing a very unequal distribution of the heat which resulted in an ineiiicient operation of the boiler. Further, the air inlet for the fire box was of such a character and so arranged that air enteringthe fire box in excess of the amount required for the purpose of combustion would pass through the fire box and be delivered to the boiler in practically an unheated condition, thus chilling the boiler and further reducing its eificiency.

One object of the invention is to provide a fire box for an oil burner which will be of such a character that the heat will be delivered to the boiler with substantial uniformity.

A further object of the invention is to so construct the fire box that any air entering the same in excess of the amountrequired for combustion purposes will be thoroughly heated before it is delivered to the boiler.

Other objects of the invention will appear as the device is described in detail.

In the accompanying drawings Fig. l is a vertical sectional view taken centrally through a fire box embodying my invention; Fig. 2 is a transverse section taken on the line 2-2 of Fig. 1; Fig. 3 is a transverse section taken on the line 3-3 of Fig. 1; Fig. 4 is a detail view, partly in section and showing therear arch in elevation; and Fig. 5 is a detail view partly in section, showing the front arch in elevation.

In these drawings I have illustrated one embodiment of my invention and have shown the same in connection with a vertical boiler of the type commonly employed 011 steam shovels. It will be understood, however, that the invention may be employed either in part or in whole with boilers of various kinds and that the construction maytake various forms without departing from the spirit of the invention.

In the present embodimentof the invention the lower portion of the boiler is shown at 1 and has mounted within the same an inner shell 2 which supports the tube sheet 3. The lower end of the boiler is supported upon a frame comprising side members 4:, and a transverse plate 5 is secured to the lower edges of the frame members and constitutes a support for the masonry of which the fire box is constructed. The fire box comprises an outer wall 6 of masonry and is here shown as circular in form and as having at the front of the boiler an opening 7 to receive a burner 8. The burner may be of any suitable character but oil burners as usually employed for this purpose are of such a characterthat the fuel is discharged under pressure across the fire box toward the rear wall thereof. The fuel being ignited as it leaves the burner the flame and products of combustion will be projected across the fire box and will rise from the rear side thereof and enter the boiler flues on the rear side of the boiler only very little of the products of combustion and heat entering the fines on the forward side of the boiler. Thejet of flame spreads out into a fan or cone. shape as it leaves the burner and the rear portion of the outer wall is made of greater height than the front portion thereof in order to adequately protect the boiler.

In the present fire box I have provided means near the rear of the fire box to cause a portion of the flame from the burner to be deflected laterally into contact with the outer wall and then forwardly so as to distribute the same over a considerable portion of the tube sheet 3. To accomplish this I have in the present form of the device mounted in the rear portion of the fire box a deflector 9, the walls of which are sub stantially vertical and diverge rearwardly. The rear ends of these walls terminate in contact with the adjacent portions of the outer wall 6 and preferably have their faces curved. as shown at 10, so that the walls of the deflector will merge into the outer wall of the fire box. This V-shaped deflector is arranged with its apex substantially in the center line of the burner so that the jet of flame which is projected across the fire box will be divided and portions thereof caused to follow the diverging walls of the deflector into contact with the circumferential wall 6 and along this wall toward the front of the fire box. Considerable portions of the flame and products of combustion will, of course, rise above the deflector 9 and I have ar ranged above the \/shaped deflector a second deflector with which the upwardly mov ing products of combustion will contact and which'will serve to deflect the same forwardly. As here shown the second deflector is in the form of an arch 11 supported on the rear portion of the outer wall "of the fire box, extending transversely to and projecting'forwa'rdly above the V-shaped deflector. Preferably this-arch is inclined upwardly and forwardly from the rear portion of the outer wall, as shown in Fig. 1. It is desirable that a portion of the products of combustion should pass upwardly directly above the deflector 9 and to this end the arch 11 is provided with a series of openings 12 of such a size that the desired portion of the products of combustion will pass through the arch, the remainder thereof being deflected forwardly, and thus distributed over the tube sheet 3. As the result of this forward deflection of the flame and other products of combustion by the deflectors 9 and 11 the heat is distributed over the tube sheet with substantial uniformity and the efliciency of the boiler is greatly increased.

The bottom wall 13 of the fire box is provided with an air inlet 14 which is arranged adjacent to the front portion of the outer wall so that it lies in part beneath the burner opening 7 and the air entering through this opening will be delivered to the fuel as it is discharged from the burner. To prevent any excess of air, which may enter through the inlet 14:, from being delivered to the boiler in an unheated condition I have provided means for deflecting this excess quantity of air in the direction of travel of the jet of flame so that it will be brought into contact with the flame and very thoroughly heatedfbefore it is delivered to the boiler flues. To this end I have mounted above the burner opening and above the air inlet a tie .flector- 15, l1ere shown in the form of an arch extending transversely of the fire box and projectmg rearwardly and upwardly from the 'fr-ont'portio n of the outer wall on p which it is supported. The arrangement of of flame that the air will be heated but it also distributes the air over the tube sheet this deflectoror arch is such that it not only brings the. air into such relation to the jet so that it is not all delivered to one part of the boiler;

While I have shown and described one embodiment of my invention I wish it to be understood that it do not desire to be limited to the details thereof as various modifications may occur to a person skilled in the art.

Having now fully described myinvention. what if claim ne and desire to secure by Letters Patent, is:

1. A fire box for a boiler con'iprising an outer wall having an opening at the front thereof to receive a burner, a deflector arranged at the rear of said lire box to cause portions of the flame and products of combustion to be deflected laterally and then forwardly, and a second deflector at the rear of said fire box to deflect :l'orwardly portions of the flame and products of combustion which pass upwardly from the first mentioned deflector, said deflectors being arranged to cause the flame and the products of combustion to be distributed with substantial uniformity to all parts of said boiler.

2. A fire box for a boiler comprising an outer wall having an opening to receive a burner and an air inlet at the front tliereof, a deflector arranged at the rear of said lire box to cause portions of the flame and prod nets of combustion to be deflected laterally and then forwardly, a second deflector at the rear of said lire box to deflectforwardly portions of the flame and products of co1n bustion which pass upwardly from the first mentioned deflector, said deflectors being ar ranged to cause the flame and the products of combustion to be distributed with substantial uniformity to all parts of said boiler, and a deflector extending rearwardly from the front wall of said lire box above said burner, terminating at a point remote from the two first mentioned deflectors and arranged to cause the air entering through said inlet to travel toward said first mentioned deflectors adjacent to the path of the flame from said burner.

3. A the box comprising an outer wall having an opening at the front thereof to receive a burner, a deflector so arranged with relation to said outer wall that a portion of the flame from said burner will be directed laterally against said outer wall and then forwardly, and a transverse deflector projecting forwardly from the rear portion of said fire box above the first mentioned deflector, said transverse deflector being spaced from the top of the first mentioned deflector and extending laterally be yond the sides thereof.

4. A fire box comprising an outer wall having an opening at the front thereof to receive a burner, a deflector arranged in the path of the flame from said burn and having substantially vertical walls diverging rearwurdly and terminating adjacentto said outer wall, and an arch carried by the rear portion of said outer wall, extending forwardly above said deflector and having openings therethrough.

5. A fire box comprising an outer wall having an opening at the front thereof to receive a burner, a deflector so arranged. with relation to said outer wall that a portion of the flame from said burner will be directed laterally against said outer wall and then forwardly, and a t 'ansverse deflcetor extending forwardly and upwardly from the rear portion of said outer wall, above the first mentioned deflector, and having openings therethrough.

6. A fire box comprising an outer wall having an opening at the front thereof to receive a burner, a deflector '50 arranged with relation to said outer wall that a portion of the flame from said burner will be directed laterally against said outer wall and then forwardly, a transverse deflector projecting forwardly from the rear portion of said fire box above the first mentioned deflector, said fire box having an air inlet through the bottom thereof, adjacent to said burner opening, and a deflector projecting rearwardly from the front portion of said fire box above said burner opening and said air inlet.

7. A fire box comprising an outer Wall having an opening at the front thereof to receive a burner, means arranged near the rear thereof to deflect a portion of the flame from said burner forwardly and upwardly, said fire box also having a bottom wall provided with an air inlet arranged beneath said burner opening, and a deflector arranged above and adjacent to said burner opening to deflect air which enters through said inlet along the path of the flame from said burner and terininatingat a point remote from the first mentioned deflecting means.

8. A fire box for a boiler comprising an outer wall having an opening therein to receive a burner, a bottom wall having an air inlet arranged beneath and communicating with said burner opening, and an arch supported by said outer wall near the upper edge of said burner opening and extending rearwardly and upwardly above said burner opening and said air inlet to direct the air from said inlet along the path of the flame from said burner and to distribute the air over the surface of the boiler.

In testimony wherof, I affix my signature hereto.

ROLLO L. SHROCK. 

